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Description of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation expense | $ 138,000,000 | $ 104,000,000 | $ 67,000,000
Impairment of long-lived assets | $ 0 |  |
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares) |  | 115.5 |
Internal-Use Software |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Period capitalized on a straight-line basis when the asset is substantially ready for use | 3 years |  |
Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Contract term | 1 month |  |
Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Contract term | 5 years |  |
Equipment | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives (in years) | 3 years |  |
Equipment | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives (in years) | 5 years |  |
Building | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives (in years) | 25 years |  |
Building | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives (in years) | 45 years |  |
Employee Stock Option |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares) | 2.0 | 2.0 | 2.6

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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